Jack



Aug. 29, 1950 D. LIGHT ETAL JACK ` Filed Sept. 1'7, 1947 f Y ggffffgll 1 z 72 P ,S71

GMM-ws Patented Aug. 29, 1950 1 Denvil Light,

semana` John mandraak, sr.. Whitesvlle, A

Y Application september 17, rima/serrano."174;618

A`troughs 'four-or -ve .times aedayv as the '.miner progresses or changes his location in the mine. The worlgisdone inrestrcted. areas where it is difficult `to make `the necessary adjustments for supporting the troughs. 'With the use ofthe jacks presently used for this purpose it vtakes ,three or four men from fteen-to' twenty minutes to set the jacks and wehave found that 'by using a jack constructed according to this invention, one man can do the necessary work in about two minutes, thus saving about an hour a day for a four man crew of miners.

Another object of this invention is to provide an improved jack of the kind to be more particularly described hereinafter in which an approximate adjustment may be made before the jack is fixed in place so that a minimum amount of actual jacking will be required to set the jack in place.

With the above and other objects in View, our invention consists in the arrangement, combination and details of construction disclosed in the drawings and specification, and then more particularly pointed out in the appended claims.

In the drawings:

Figure 1 is a side elevation, partly broken away and partly in section, of an improved mine trough supporting jack constructed according to an embodiment of our invention,

Figure 2 is a side elevation, partly broken away and partly in section,

Figure 3 is a top plan view.

Referring to the drawing, the numeral lil designates generally a jack used in coal mines and the like for supporting the troughs on which the material is deposited immediately after it is removed from the mine. The troughs with which the jacks I are to be used are changed in their position in the mines as frequently as four or five times a day, and it is necessary to lower the supporting jacks each time the trough is moved. There are a number of jacks presently used for this work which require the laborA of four or ve men for nearly half an hour each time it is de sired to lower the jacks and set up the trough in a differentposition.

The jack Ill of this invention is designed to be operated by one man in a shorter period of time iis raised and lowered within the casing il' yby fany suitable conventional' means. athis work; usually .gears and threaded `bolts are InV jacks `for iusedior actuating the jack shaft I2.

.A head `I! is xed to or formed-on the upper end of the jack shaft I2. A'threaded bolt I5'is nxed onfthe uppersidezof the head Ill by welding ISB, or other Asuitable `fastening means. The` bolt i5 is substantially coaxial andv concentric with the l.iaokshaft I2. l Atubular-sleeve IFI, having linternal threads, is threadably engaged about the bolt I5. to provide anupperextension member-.I8 for the -jackshaft I2.. A head or pad I9 is fixed on the upper end of the sleeve or tubular member Il. The upper side of the head I9 is knurled as at 20, to provide a frictionsurface for supporting Ythe jack. The tubular member I1 is adapted to be adjusted by rotation about the bolt I5 to an approximate adjustment` so that the jack I0 may be disposed in its desired place in such a manner that only a small amount of geared jacking is required.

A reinforcing band or sleeve 2l is xed about the lower, end of the casing II. The casing II is of .a conventional construction for jacks and as the jack for mining purposes is subjected to increased vertical loads, the reinforcing band 2I will sufficiently reinforce the casing.

'A downwardly extending cylindrical lug 22 is fixed` n the lower end of the casing II by weldm ing 24or other suitable fastening means. The l lugf22 is concentric to the annular casing II and coaxial with the bolt I5 and jack shaft I2. A base 25 iswprovided for the jack III and is formed of a lower horizontal plate 2S having a cylindricalLo'r-"tubular member 2'I xed on the upper surface thereof. The lower end of the cylindrical lug 22 .is'adapted to engage within the cylindrical member 21fso that it may be rotated to a desired position. g

A Set Screw 28 engages through the walls of the member 21 and abuttingly engages the outer side wall of the lug 22 for securing the lug and jack lIIJ in selected rotated position. A sleeve 28 is disposed about the lug 22 between the upper end of the member 2l and the lower end of the casing` II.' The member 29 is free for rotation about the lug 22.

A pair of outwardly extending arms 30 are fixed on one side of the member 29 and a trough supportingjrod or shaft 3I is pivotally engaged therebetween. A pivot pin or bolt 32 engages be- Y tween the horizontally spaced apart arms 30 and proximate dimensions of the opening within Awhich the the jackfl isV to bengagdi When the jack and trough supporting arm 3l are set in position only a small amount of movement of comprising a jack, an extensible member in saidV jack, an adjustablerextension member carried by said extensible member, a tubular base, a depending jack supporting member on said casing engaging in said base, a collar rotatably carried by said supporting member, and a trough engaging arm rockably connected to said collar. 3. An improved mine trough supporting jack' comprising a'casing, agfjacklshaft extensibly carried vby said casing,A a'threaded bolt carried by said jack shaft, a sleeve threadably engaging said the'jack shaft I2 is required for fixedly securing of said sleeve, a cylindrical supporting shaft thejack I0 in place. 'I'he necessary rotation ofthe jack I!) relative to thetrough may be readily accomplished by rotating vthe jack within the cylindrical sleeve 29 so that the actuating-means for the jack shaft l2 may behdisposed inv a readily accessible position.

We do not mean to 4confine ourselves Ato the' 'exact details of construction herein disclosed, but

claim all variations falling withinlthepurview: of the appended claims.v V

Y Having thus described our inventionywhat we i claim is:V f

` 1.An improved jack` comprising a casing 'an' extensible jack member in-said casing, a threaded bolt carried by said extensible membena tubular jack extension on said'extensible member threadable on said bolt, a tubular supporting base, a jack supporting bearing member on the bottom of Vsaid bolt above said casing, ahead on the upperrend cluding a lower ground engaging plate, a tubular vertically extending jack supporting member on Y said plate, Asaidsupporting shaft engaging in said tubular member, a sleeve rotatable about said supporting shaft between said base and said casing, means securing said sleeve in a selected adjusted position Jon said shaft fandatrough engaging member pivotally .mounted on said latter REFERENCSfCrTED The following references of record inthe file -ofV this patent:

30V UNITED BATNTS VNumber Name y DateV Re. 21,349 Jarrett i Feb..13, 1940 2,239,578 Sloane f f Apr. 22, 1941 ist 2,270,778 a Bebingerl Jan. :20; 1942 

